CA3235101A1 - Electrochromic gels and devices containing them - Google Patents
Electrochromic gels and devices containing them Download PDFInfo
- Publication number
- CA3235101A1 CA3235101A1 CA3235101A CA3235101A CA3235101A1 CA 3235101 A1 CA3235101 A1 CA 3235101A1 CA 3235101 A CA3235101 A CA 3235101A CA 3235101 A CA3235101 A CA 3235101A CA 3235101 A1 CA3235101 A1 CA 3235101A1
- Authority
- CA
- Canada
- Prior art keywords
- electrochromic
- conductor
- gel
- poly
- optical substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920000553 poly(phenylenevinylene) Polymers 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229960002796 polystyrene sulfonate Drugs 0.000 description 1
- 239000011970 polystyrene sulfonate Substances 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- RKCAIXNGYQCCAL-UHFFFAOYSA-N porphin Chemical compound N1C(C=C2N=C(C=C3NC(=C4)C=C3)C=C2)=CC=C1C=C1C=CC4=N1 RKCAIXNGYQCCAL-UHFFFAOYSA-N 0.000 description 1
- 150000004032 porphyrins Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 235000010388 propyl gallate Nutrition 0.000 description 1
- 239000000473 propyl gallate Substances 0.000 description 1
- 229940075579 propyl gallate Drugs 0.000 description 1
- 239000003586 protic polar solvent Substances 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- PFSKLZABYDOTKP-UHFFFAOYSA-N pyridine;zinc Chemical compound [Zn].C1=CC=NC=C1 PFSKLZABYDOTKP-UHFFFAOYSA-N 0.000 description 1
- 229940079877 pyrogallol Drugs 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000012812 sealant material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 235000010378 sodium ascorbate Nutrition 0.000 description 1
- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 description 1
- 229960005055 sodium ascorbate Drugs 0.000 description 1
- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical compound [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 125000005207 tetraalkylammonium group Chemical group 0.000 description 1
- 125000005497 tetraalkylphosphonium group Chemical group 0.000 description 1
- FHCPAXDKURNIOZ-UHFFFAOYSA-N tetrathiafulvalene Chemical compound S1C=CSC1=C1SC=CS1 FHCPAXDKURNIOZ-UHFFFAOYSA-N 0.000 description 1
- 150000003573 thiols Chemical group 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- KAKQVSNHTBLJCH-UHFFFAOYSA-N trifluoromethanesulfonimidic acid Chemical compound NS(=O)(=O)C(F)(F)F KAKQVSNHTBLJCH-UHFFFAOYSA-N 0.000 description 1
- RIOQSEWOXXDEQQ-UHFFFAOYSA-O triphenylphosphanium Chemical compound C1=CC=CC=C1[PH+](C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-O 0.000 description 1
- 235000019163 vitamin B12 Nutrition 0.000 description 1
- 239000011715 vitamin B12 Substances 0.000 description 1
- 235000019165 vitamin E Nutrition 0.000 description 1
- 229940046009 vitamin E Drugs 0.000 description 1
- 239000011709 vitamin E Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K9/00—Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
- C09K9/02—Organic tenebrescent materials
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1514—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material
- G02F1/1516—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material comprising organic material
- G02F1/15165—Polymers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1514—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material
- G02F1/1523—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material comprising inorganic material
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1514—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material
- G02F1/1516—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material comprising organic material
- G02F2001/1517—Cyano complex compounds, e.g. Prussian blue
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Cosmetics (AREA)
Abstract
Electrochromic gels that include 20 to 99 wt.% of a polar solvent, 0.5 to 25 wt.% of a rheology modifying agent, and 0.5 to 20 wt.% of an electrochromic material. The rheology modifying agent is soluble in the polar solvent and forms a gel at ambient conditions when dissolved.
Description
ELECTROCHROMIC GELS AND DEVICES CONTAINING THEM
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of priority of U.S. Provisional Application 63/276,009 filed November 5, 2021, under 35 U.S.C. 119, titled "Electrochromic Gels and Devices Containing Them", which is incorporated herein by reference.
FIELD
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of priority of U.S. Provisional Application 63/276,009 filed November 5, 2021, under 35 U.S.C. 119, titled "Electrochromic Gels and Devices Containing Them", which is incorporated herein by reference.
FIELD
[0002] This disclosure generally relates to electrochromic gels, optical devices containing them and methods of making them.
BACKGROUND
BACKGROUND
[0003] Electrochromic materials, typically placed in a cell for use, have demonstrated utility in displays, transparent devices, and smart systems for the automotive, aerospace, eyewear, and building industries.
SUMMARY
SUMMARY
[0004] This disclosure describes electrochromic gels that include 20 to 99 wt.% of a polar solvent, 0.5 to 25 wt.% of a rheology modifying agent, and 0.5 to 20 wt.% of an electrochromic material. The rheology modifying agent is soluble in the polar solvent and forms a thermoreversible gel at ambient conditions when dissolved.
DESCRIPTION OF THE DRAWINGS
DESCRIPTION OF THE DRAWINGS
[0005] Figure 1 is a nonlimiting depiction of transmittance vs. time during operation of electrochromic cells according to the disclosure.
[0006] Figure 2 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale.
[0007] Figure 3 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale.
[0008] Figure 4 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale.
[0009] Figure 5 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale.
SUBSTITUTE SHEET (RULE 26)
SUBSTITUTE SHEET (RULE 26)
[0010] Figure 6 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale.
[0011] Figure 7 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale.
[0012] Figure 8 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale.
[0013] Figure 9 is a graph of viscosity versus shear rate according to the disclosure.
[0014] Figure 10 is a graph showing the relationship between complex viscosity and temperature versus time according to the disclosure.
DETAILED DESCRIPTION
DETAILED DESCRIPTION
[0015] Unless otherwise indicated, conditions of temperature and pressure are ambient temperature (22 C), a relative humidity of 30%, and standard pressure of 101.3 kPa (1 atm).
[0016] Unless otherwise indicated, any term containing parentheses refers, alternatively, to the whole term as if parentheses were present and the term without them, and combinations of each alternative. Thus, as used herein the term, "(meth)acrylate" and like terms is intended to include acrylates, methacrylates and their mixtures.
[0017] It is to be understood that this disclosure may assume various alternative variations and step sequences, except where expressly specified to the contrary.
Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that can vary depending upon the desired properties to be obtained. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that can vary depending upon the desired properties to be obtained. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
[0018] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the disclosure are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard variation found in their respective testing measurements.
[0019] Also, it should be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all sub-ranges between (and including) the recited minimum value of 1 and the SUBSTITUTE SHEET (RULE 26) recited maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value of equal to or less than 10.
[0020] All ranges are inclusive and combinable. For example, the term "a range of from 0.06 to 0.25 wt.%, or from 0.06 to 0.08 wt.%" would include each of from 0.06 to 0.25 wt.%, from 0.06 to 0.08 wt.%, and from 0.08 to 0.25 wt.%. Further, when ranges are given, any endpoints of those ranges and/or numbers recited within those ranges can be combined within the scope of the present disclosure.
[0021] As used herein, unless otherwise expressly specified, all numbers such as those expressing values, ranges, amounts or percentages can be read as if prefaced by the word "about", even if the term does not expressly appear. Unless otherwise stated, plural encompasses singular and vice versa. As used herein, the term "including" and like terms means "including but not limited to-. Similarly, as used herein, the terms "on", "applied on/over", "formed on/over", "deposited on/over". "overlay" and "provided on/over" mean formed, overlay, deposited, or provided on but not necessarily in contact with the surface. For example, a coating layer "formed over" a substrate does not preclude the presence of one or more other coating layers of the same or different composition located between the formed coating layer and the substrate.
[0022] As used herein, the transitional term "comprising" (and other comparable terms, e.g ., "containing" and "including") is "open-ended" and open to the inclusion of unspecified matter. Although described in terms of "comprising", the terms "consisting essentially of' and "consisting of' are also within the scope of the disclosure.
[0023] As used herein, the articles "a", "an", and "the" include plural references unless expressly and unequivocally limited to one referent.
[0024] As used herein, the term "anode" refers to an electrode through which a conventional current enters into an electrical device.
[0025] As used herein, the term "block copolymer" refers to copolymers where the repeat units exist only in long sequences, or blocks, of the same type.
[0026] As used herein, the term "cathode" refers to an electrode through which a conventional current leaves an electrical device.
[0027] As used herein, the term "coating layer" refers to the result of applying one or more coating compositions on a substrate in one or more applications of such one or more coating compositions.
[0028] As used herein the term "compound" refers to a substance formed by the union of two or more elements, components, ingredients, or parts and includes, without limitation, SUBSTITUTE SHEET (RULE 26) molecules and macromolecules (for example polymers and oligomers) formed by the union of two or more elements, components, ingredients, or parts.
[0029] As used herein, the terms "conjugated polymers- and "conjugated copolymers"
refer to organic macromolecules that are characterized by a backbone chain of alternating double- and single-bonds. Their overlapping p-orbitals create a system of delocalized IL-electrons, which can result in useful optical and electronic properties.
refer to organic macromolecules that are characterized by a backbone chain of alternating double- and single-bonds. Their overlapping p-orbitals create a system of delocalized IL-electrons, which can result in useful optical and electronic properties.
[0030] As used here, the term "cut and stick" refers to a method of applying a coating material by forming a free standing coating film and laminating the film to a substrate, as a nonlimiting example, pressing a gel between two electrodes that are a fixed distance apart from each other.
[0031] As used here, the term "draw down" refers to a method and associated equipment used to apply a coating to a substrate by drawing a coating materials across the substrate using a wire or metering rod at a fixed distance (coating layer thickness) from the substrate.
[0032] As used herein, the term "electric potential" refers to the amount of work needed to move a unit charge from a reference point to a specific point against an electric field.
[0033] As used herein, the term "electrode" refers to a conductor through which electricity enters or leaves an object or substance.
[0034] As used herein, the term "electrochromic material" refers to materials that are able to vary their coloration and/or transparency to radiation, in a reversible manner, when they are subjected to an electric field.
[0035] As used herein the term "electromagnetic radiation" refers to the waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy.
Nonliiniting examples include radio waves, microwaves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays.
Nonliiniting examples include radio waves, microwaves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays.
[0036] As used herein the term "fully cleared state" refers to an electrochromic cell or system with a percent transmittance (%T) above the minimum transmittance value by least at 85% of the optical contrast in the absence of applied voltage.
[0037] As used herein the term "fully darkened state" refers an electrochromic cell or system with a percent transmittance (%T) below the maximum transmittance value by least at 85% of the optical contrast at a given voltage.
[0038] As used herein, the term "gel" refers to a nonfluid polymer network that is expanded throughout its whole volume by a fluid. Such polymer networks may include covalently crosslinked polymer chains, or a polymer network formed through the physical aggregation SUBSTITUTE SHEET (RULE 26) of polymer chains caused by hydrogen bonds, crystallization, helix formation, complexation, etc., that results in regions of local order acting as the network junction points.
[0039] As used herein, the term "lamination" refers to producing a composite system by using two or more materials stacked in layers.
[0040] As used herein, the term "layer" refers to a thickness of some material laid on, spread, or applied over a surface of another material.
[0041] As used herein, the term "metal mesh" refers to fine woven wire that acts as transparent conductive electrodes and, as nonlimiting examples, can be constructed of Au, Ag, Al, Fe, Co, Ni and/or Cu.
[0042] As used herein, the terms "luminance" or "photopic transmittance" refer to transmittance over the visible region (380 nm to 780 nm) that is normalized with respect to the illumination source and weighted to the sensitivity of the human eye.
[0043] As used herein, the term "maximum transmittance" refers to transmittance exhibited by a device at a specific wavelength or range of wavelengths, in the absence of any voltage for at least 24 h.
[0044] As used herein, the term "minimum transmittance" refers to transmittance exhibited by a device at a specific wavelength or range of wavelengths, upon the application of voltage, which can either be direct voltage or variable voltage having a specific waveform, for at least 24 h.
[0045] As used herein, the term "optically clear" refers to 30% or higher transmittance in the visible region of the electromagnetic spectrum (380-720 nm).
[0046] As used herein, the term "optical contrast" refers to the difference between the maximum transmittance and the minimum transmittance of a device at a specific wavelength or range of wavelengths.
[0047] As used herein, the term "optical substrate" refers to a substrate made of materials with good light transmittance, in at least some spectral ranges, exhibiting little absorption and scattering of light. Nonlimiting examples include glass, such as fused silica and fused quartz, which can include alkali-aluminosilicate glass such as that used as touch screens for hand-held electronic devices.
[0048] As used herein, the terms "oxidation - reduction reaction- and "redox"
refer to reactions that are characterized by the actual or formal transfer of electrons between chemical species, often with one species undergoing oxidation while another species undergoes reduction.
SUBSTITUTE SHEET (RULE 26)
refer to reactions that are characterized by the actual or formal transfer of electrons between chemical species, often with one species undergoing oxidation while another species undergoes reduction.
SUBSTITUTE SHEET (RULE 26)
[0049] As used herein, the term "phenazine and its derivatives" includes substituted and unsubstituted dibenzo annulated pyrazine (Ci2H8N, - phenazine) and (Ce2R21.0N2) where each R2 independently represents FL, OH, NR31 (where each R3 independently represents H and CI
to C3 alkyl), CI to C12 linear or branched alkyl containing up to one less than the number of substituent carbons of hydroxyl, thiol, halogen, siloxane, amine, ketone, carboxyl, amide, and ether groups, aromatic groups containing 6 to 18 carbon atoms and, optionally, one or more h.etero atoms including 0, N and S and, optionally C1 to C12 linear or branched alkyl containing up to one less than the number of substituent carbons of hydroxyl, thiol, halogen silox.ane, amine, ketone, carboxyl, amide, and/or ether groups. Nonlitni Ling examples of phenazine derivative include dimethyl phenazine and dlisopropyl phenazine.
to C3 alkyl), CI to C12 linear or branched alkyl containing up to one less than the number of substituent carbons of hydroxyl, thiol, halogen, siloxane, amine, ketone, carboxyl, amide, and ether groups, aromatic groups containing 6 to 18 carbon atoms and, optionally, one or more h.etero atoms including 0, N and S and, optionally C1 to C12 linear or branched alkyl containing up to one less than the number of substituent carbons of hydroxyl, thiol, halogen silox.ane, amine, ketone, carboxyl, amide, and/or ether groups. Nonlitni Ling examples of phenazine derivative include dimethyl phenazine and dlisopropyl phenazine.
[0050] As used herein, the term "polar solvent" refers to chemical compounds having a dipole moment greater than 1.25 containing (protic) or not containing (aprotic) one or more hydrogen atoms attached to an electronegative atom and capable of dissolving a rheology modifying agent.
[0051] As used herein, the term "polymer" includes homopolymers (formed from one monomer) and copolymers and block copolymers that are formed from two or more different monomer reactants or that include two or more distinct repeat units. Further, the term "polymer" includes prepolymers, and oligomers.
[0052] As used herein, the term "power source" refers to a source of electrical potential, voltage or other electric current provider electrically connected to two or more electrodes, nonlimiting examples include, batteries, transformers that convert conventional AC or DC
current to an acceptable level, photovoltaic mediums, capacitors, super capacitors, and combinations thereof.
current to an acceptable level, photovoltaic mediums, capacitors, super capacitors, and combinations thereof.
[0053] As used herein, the terms "pseudoplastie' and "shear thinning" refer to a solution, suspension or other mixture where it takes on non-Newtonian behavior such that viscosity decreases under increasing shear stress.
[0054] Unless otherwise noted, all rheology data (nonlimiting examples including complex viscosity, loss modulus, etc.) reported herein were measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software.
[0055] As used herein, the term "rheology modifying agent" refers to a composition, soluble in a polar solvent, that forms a thermoreversible gel at ambient conditions after dissolution.
SUBSTITUTE SHEET (RULE 26)
SUBSTITUTE SHEET (RULE 26)
[0056] As used herein, the term "screen printing" refers to a method of applying a coating material to a substrate by stretching a thin mesh over a substrate and the coating material is rolled over the screen to apply a coating layer to the substrate.
[0057] As used herein, the term "short circuit" refers to an electrical circuit having an unintended connection point resulting in accidental diversion of the current.
[0058] For purposes of the present disclosure, a material is considered "soluble" if a minimum of 0.5% by weight of the material is capable of dissolving in the specified solvent
[0059] As used herein, the term "spin coating" refers to a method of applying a coating material to a substrate by placing a coating material on the substrate, which is either spinning at low speed or not spinning at all and rotating the substrate a speed sufficient to spread the coating material across the substrate by centrifugal force.
[0060] As used herein, the term "spray coating" refers to a coating processes that uses a spray of droplets to deposit a coating material onto a substrate.
[0061] As used herein, the term "thermoreversible gel" refers to a gel formed through physical aggregation of polymer chains, in which regions of local order can change in response to changes in temperature.
[0062] As used herein, the term "transparent" refers to allowing light to pass through a material so that objects behind can be distinctly seen. As nonlimiting examples, the term "substantially transparent" seeing a surface at least partially visible to the naked eye when viewed through the material and the term "fully transparent" refers seeing to a surface as completely visible to the naked eye when viewed through the material.
[0063] As used herein, the term "transmitted radiation" refers to radiation that is passed through at least a portion of an object.
[0064] As used herein, the term "viologen and its derivatives" includes organic compounds with the formulas (C5F14N)2 (viologen) and (C5H4NR)2", where R represents Ci to C12 linear or branched alkyl containing up to one less than the number of substituent carbons of hydroxyl, thiol., halogen, siloxane, airline, ketone, carboxyl, amide, and ether groups, aromatic groups containing 6 to 18 carbon atoms and, optionally, one or more hetero atoms including 0, N and S and, optionally Ci to Ci_2 linear or branched alkyl containing up to one less than the number of substituent carbons of hydroxyl, thioi, halogen siloxane, amine, ketone, carboxyl, amide, and/or ether groups Nonlimiting examples of viologen derivatives include N,N'- (theml viologen (heptyl violog,en) and N,N'- diphenyl viologen with nonlimiting examples of counteriorts tetrafluoro borate and phosphorous tetrafluoride, SUBSTITUTE SHEET (RULE 26)
[0065] As used herein, the term "voltage" refers to the difference in electric potential between two points.
[0066] This disclosure is directed to electrochromic gels that include a polar solvent, a rheology modifying agent, and an electrochromic material. The rheology modifying agent is soluble in the polar solvent and forms a thermoreversible gel at ambient conditions when dissolved.
[0067] The polar solvent can be included in the electrochromic gel at a level of at least 20 wt.%, such as 25 wt.% and 30 wt.% and can be up to 99 wt.%, such as 95wt.%, 90wt.%, 85 wt.% and 80wt.%, based on the total weight of the electrochromic gel. The amount of polar solvent in the electrochromic gel can be from 20 to 99 wt.%, such as from 20 to 90 wt.%, 20 to 80 wt.%, 25 to 99 wt.%, 25 to 90 wt.%, 25 to 80 wt.%, 30 to 99 wt.%, 30 to 90 wt.%, and 30 to 80 wt.%. The amount of polar solvent included in the electrochromic gel can be any value or range between any of the values recited above.
[0068] The polar solvent can include protic or aprotic polar solvents and mixtures thereof.
[0069] Nonlimiting examples of aprotic solvents that can be used in the electrochromic gel include Ci to C6 alkyl carbonates; Ci to C6 alkyl phosphates; ketones of CI to C12 linear or branched alkanes, nonlimiting examples including acetone and methyl isobutyl ketone;
methyl ethyl ketone, dimethyl sulfoxide and dimethyl formamide.
methyl ethyl ketone, dimethyl sulfoxide and dimethyl formamide.
[0070] Nonlimiting examples of protic solvents that can be used in the electrochromic gel include Ci to C6 alcohols, water, and formamide.
[0071] The rheology modifying agent can be included in the electrochromic gel at a level of at least 0.5 wt.%, such as 1 wt.% and 2 wt.% and can be up to 25 wt.%, such as 20 wt.%, 15wt.%, and lOwt.%, based on the total weight of the electrochromic gel. The amount of rheology modifying agent in the electrochromic gel can be from 0.5 to 25 wt.%, such as from 0.5 to 20 wt.%, 0.5 to 10 wt.%, 1 to 25 wt.%, 1 to 20 wt.%, 1 to 10 wt.%, 2 to 25 wt.%, 2 to 20 wt.%, and 2 to 10 wt.%. The amount of _theology modifying agent included in the electrochromic gel can be any value or range between any of the values recited above. If the amount of rheology modifying agent is too low, the electrochromic gel may not form a gel that can be applied as a coating layer as described herein. If the amount of rheology modifying agent is too high, the resulting electrochromic gel may have rheological properties that do not readily allow the electrochromic gel to be applied as a coating layer as described herein.
[0072] The rheology modifying agent can be any material that provides the electrochromic gel with the rheological properties described herein when combined with a polar solvent, SUBSTITUTE SHEET (RULE 26) nonlimiting examples including pseudoplastic behavior and thermoreversible gel properties.
Nonlimiting examples of rheology modifying agents that can be used in the electrochromic gel include poly(vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), poly(dimethylsiloxane), poly(vinyl chloride), poly(vinyl alcohol), poly(methyl (meth)acrylate), poly(ethylene oxide), poly(propylene carbonate) and combinations thereof.
Nonlimiting examples of rheology modifying agents that can be used in the electrochromic gel include poly(vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), poly(dimethylsiloxane), poly(vinyl chloride), poly(vinyl alcohol), poly(methyl (meth)acrylate), poly(ethylene oxide), poly(propylene carbonate) and combinations thereof.
[0073] As a nonlimiting example, the thermoreversible gel can be a gel at up to 25 C, such as up to 30 C, or up to 35 C or up to 40 C. As a further nonlimiting example, the thermoreversible gel can be a fluid at 120 C, such as greater than 100 C, greater than 90 C or greater than 80 C.
[0074] The electrochromic material can be included in the electrochromic gel at a level of at least 0.5 wt.%, such as 1 wt.% and 2 wt.% and can be up to 20 wt.%, such 15wt.%, and lOwt.%, based on the total weight of the electrochromic gel. The amount of rheology modifying agent in the electrochromic gel can be from 0.5 to 20 wt.%, such as from 0.5 to 15 wt.%, 0.5 to 10 wt.%, 1 to 20 wt.%, 1 to 15 wt.%, 1 to 10 wt.%, 2 to 20 wt.%, 2 to 15 wt.%, and 2 to 10 wt.%. The amount of electrochromic material included in the electrochromic gel can be any value or range between any of the values recited above. If the amount of electrochromic material is too low or too high, the electrochromic gel may not provide the electrochromic properties as described herein.
[0075] The electrochromic material can include a cathodic electrochromic agent and an anodic electrochromic agent, acting as an oxidation ¨ reduction pair. The oxidation ¨
reduction reaction can result in the electrochromic gel turning dark or colored. The color can depend on the electrochromic agent used. As nonlimiting examples, the cathodic electrochromic agent can include viologen and its derivatives and the anodic electrochromic agent can be phenazine and its derivatives.
reduction reaction can result in the electrochromic gel turning dark or colored. The color can depend on the electrochromic agent used. As nonlimiting examples, the cathodic electrochromic agent can include viologen and its derivatives and the anodic electrochromic agent can be phenazine and its derivatives.
[0076] Nonlimiting examples of cathodic electrochromic materials include viologen and its derivatives (nonlimiting examples including dialkyl viologens and diaryl viologens).
Nonlimiting examples of anodic electrochromic materials include phenazine and its derivatives (nonlimiting examples including dialkyl phenazines and diaryl phenazines), N,N,N',N' -tetramethyl-p-phenylenediamine, 10-methylphenothiazine, 10-ethylphenothiazine, and tetrathiafulvalene.
Nonlimiting examples of anodic electrochromic materials include phenazine and its derivatives (nonlimiting examples including dialkyl phenazines and diaryl phenazines), N,N,N',N' -tetramethyl-p-phenylenediamine, 10-methylphenothiazine, 10-ethylphenothiazine, and tetrathiafulvalene.
[0077] As a nonlimiting example, the electrochromic gel can have a complex viscosity at 25 C of at least 5,000 mPa-s, such as at least 10,000 mPa-s, 20,000 mPa-s and 30,000 mPa-s and can be up to 3,000,000 mPa-s, such as 2,500,000 mPa-s, 2,000,000 mPa-s and 1,500,000 mPa-s. The complex viscosity of the electrochromic gel can be from 5,000 mPa-s to SUBSTITUTE SHEET (RULE 26) 3,000,000 mPa-s, such as from 5,000 mPa-s to 2,500,000 mPa-s, 5,000 mPa-s to 1,500,000 mPa-s, 10,000 mPa-s to 3,000,000 mPa-s, 10,000 mPa-s to 2,500,000 mPa-s, 10,000 mPa-s to 1,500,000 mPa-s, 20,000 mPa-s to 3,000,000 mPa-s, 20,000 mPa-s to 2,500,000 mPa-s, and 20,000 mPa-s to 1,500,000 mPa-s. The complex viscosity can be measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software.
[0078] As a nonlimiting example, the electrochromic gel can have a complex viscosity at 90 C of at least 500 mPa-s, such as at least 750 mPa-s, and 1,000 mPa-s and can be up to 3,000 mPa-s, such as 2,500 mPa-s and 2,000 mPa-s at 90 C. The complex viscosity of the electrochromic gel can be from 500 mPa-s to 3,000 mPa-s, such as from 500 mPa-s to 2,500 mPa-s, 500 mPa-s to 2,000 mPa-s, 750 mPa-s to 3,000 mPa-s, 750 mPa-s to 2,500 mPa-s, 750 mPa-s to 2,000 mPa-s, 500 mPa-s to 3,000 mPa-s, 500 mPa-s to 2,500 mPa-s, and 500 mPa-s to 2,000 mPa-s. The complex viscosity can be measured using an Anton Paar MCR
rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software.
rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software.
[0079] As a nonlimiting example, the electrochromic gel can have a viscosity ¨
shear rate slope of from -1 to -10 mPa-s2, such as -1.5 to -7 mPa-s2 and -2 to -5 mPa-s2 at 25 C
measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software at a shear rate of from 0.01 to 1s'.
shear rate slope of from -1 to -10 mPa-s2, such as -1.5 to -7 mPa-s2 and -2 to -5 mPa-s2 at 25 C
measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software at a shear rate of from 0.01 to 1s'.
[0080] As a nonlimiting example, the electrochromic gel can have a viscosity ¨
shear rate slope of from -0.5 to 0.5 mPa-s2, such as -0.4 to 0.4 mPa-s2 and -0.3 to 0.3 mPa-s2 at 90 C measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software at a shear rate of from 1 to 100 s-1.
shear rate slope of from -0.5 to 0.5 mPa-s2, such as -0.4 to 0.4 mPa-s2 and -0.3 to 0.3 mPa-s2 at 90 C measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software at a shear rate of from 1 to 100 s-1.
[0081] As a nonlimiting example, the electrochromic gel can have a complex viscosity ¨
temperature slope of from 40 mPa-s/ C to 250 mPa-s/ C, such as 50 mPa-s/ C to 200 mPa-s/ C and 60 mPa-s/ C to 150 mPa-s/ C measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software decreasing temperature from 90 C to 25 C over six minutes at an oscillation shear strain of 1% and a constant frequency of 10 rad/s.
temperature slope of from 40 mPa-s/ C to 250 mPa-s/ C, such as 50 mPa-s/ C to 200 mPa-s/ C and 60 mPa-s/ C to 150 mPa-s/ C measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software decreasing temperature from 90 C to 25 C over six minutes at an oscillation shear strain of 1% and a constant frequency of 10 rad/s.
[0082] As a nonlimiting example, the electrochromic gel can have a complex viscosity ¨
temperature slope of from -40,000 mPa-s/ C to -250,000 mPa-s/ C, such as -50,000 InPa-SUBSTITUTE SHEET (RULE 26) s/ C to -200,000 mPa-s/ C and -60,000 mPa-s/ C to -150,000 mPa-s/ C measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software increasing temperature from 25 C to 90 C over six minutes at an oscillation shear strain of 1% and a constant frequency of 10 rad/s.
temperature slope of from -40,000 mPa-s/ C to -250,000 mPa-s/ C, such as -50,000 InPa-SUBSTITUTE SHEET (RULE 26) s/ C to -200,000 mPa-s/ C and -60,000 mPa-s/ C to -150,000 mPa-s/ C measured using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RheoCompass software increasing temperature from 25 C to 90 C over six minutes at an oscillation shear strain of 1% and a constant frequency of 10 rad/s.
[0083] The electrochromic gel can optionally include additives such as electrolyte salts, antioxidants, ultraviolet (UV) stabilizers, oxygen scavengers, light blocking additives or combinations of any two or more thereof. The additives can be added in concentrations of 0.05 wt.% to 20 wt.%, or up to the solubility limit of each of the additives in the electrochromic gel.
[0084] As a nonlimiting example, electrolyte salts can contain a combination of a cationic part (positively charged) and an anionic part (negatively charged). Examples of cationic parts include, but are not limited to, lithium, tetraalkylammonium (alkyl is any group having formula Cr,H211.0 where n is a integer), triakylammonium, triphenylphosphonium, N-alkylpyridinium and its derivatives, N,N'-dialkylimidazolium and its derivatives, tetraalkylphosphonium, N ,N -dialkylpyrrolidinium and its derivatives.
Examples of anionic parts include, but are not limited to, tetrafluoroborate, triflate, triflamide, hexafluorophosphate, chloride, bromide, iodide, fluoride, dicyanamide, carboxylate, phosphinate, dialkylphosphate, tosylate, alkylsulfate, acetate, hi s(trifluoromethanesulfonyl)imide, trifluoromethanesulfonate, hydrogen sulphate.
Examples of anionic parts include, but are not limited to, tetrafluoroborate, triflate, triflamide, hexafluorophosphate, chloride, bromide, iodide, fluoride, dicyanamide, carboxylate, phosphinate, dialkylphosphate, tosylate, alkylsulfate, acetate, hi s(trifluoromethanesulfonyl)imide, trifluoromethanesulfonate, hydrogen sulphate.
[0085] Antioxidants and oxygen scavengers include, but are not limited to, butyl ated hydroxytoluene (BHT), 4-tert-butylcatechol, pyrogallol, 6-tert-butyl-2,4-xylenol, 2-butanone oxime, hydroquinone, ascorbic acid, diethylhydroxylamine, catechin, ell agic acid, curcumin, vitamin E, sodium ascorbate, propyl gallate, butylhydroxyanisol (BHA), sterically hindered phenolic antioxidants (including derivatives thereof).
[0086] UV stabilizers can include classes of materials commonly referred to as UV absorbers and hindered amine light stabilizers (HALS). Examples of UV stabilizers include, but are not limited to, oxybenzone and its derivatives, benzotriazoles and its derivatives, triazines and its derivatives, benzophenones and its derivatives, TINUVIN series of UV
stabilizers trademarked and sold by BASF SE of Ludwigshafen, Germany. Non-limiting commercial examples of UV stabilizers include, but not limited to, TINUVIN P, TINUVIN
1130, TINUVIN 99-2, TINUVIN 384-2, TINUVIN 400, TINUVIN 479, TINUVIN 477, TINUVIN
SUBSTITUTE SHEET (RULE 26) Carboprotect, TINUVIN 123, TINUVIN 144, TINUVIN 292, TINUVIN 151, TINUVIN 152, TINUVIN 213, TINUVIN 234, TINUVIN 326, TINUVIN 327, TINUVIN 328, TINUVIN
571, TINUVIN 622, TINUVIN 765, TINUVIN 770, an IRGANOX compound (e.g., IRGANOX 245, IRGANOX 1010, IRGANOX 1035, IRGANOX 1076, IRGANOX 1098, IRGANOX 1135, and/or IRGANOX 5057; each available from BASF SE of Ludwigshafen, Germany), Unitex OB (available from Angene Chemica of Hong Kong), a CHIMASSORB
compound (e.g., CHIMASSORB 81, CHIMASSORB 944 LD, and/or CHIMASSORB 2020 FLD; each available from BASF SE of Ludwigshafen, Germany), a BLS compound (e.g., BLS 99-2, BLS 119, BLS 123, BLS 234, BLS 292, BLS 531, BLS 0113-3, BLS 1130, BLS
1326, BLS 1328, BLS 1710, BLS 2908, BLS 3035, BLS 3039, and/or BLS 5411; each available from Mayzo Inc. of Suwanee, Ga, USA), and/or CYASORB CYNERGY
SOLUTIONS L143-50X Stabilizer (available from Cytec Industries, Inc. of Woodland Park, NJ, USA).
stabilizers trademarked and sold by BASF SE of Ludwigshafen, Germany. Non-limiting commercial examples of UV stabilizers include, but not limited to, TINUVIN P, TINUVIN
1130, TINUVIN 99-2, TINUVIN 384-2, TINUVIN 400, TINUVIN 479, TINUVIN 477, TINUVIN
SUBSTITUTE SHEET (RULE 26) Carboprotect, TINUVIN 123, TINUVIN 144, TINUVIN 292, TINUVIN 151, TINUVIN 152, TINUVIN 213, TINUVIN 234, TINUVIN 326, TINUVIN 327, TINUVIN 328, TINUVIN
571, TINUVIN 622, TINUVIN 765, TINUVIN 770, an IRGANOX compound (e.g., IRGANOX 245, IRGANOX 1010, IRGANOX 1035, IRGANOX 1076, IRGANOX 1098, IRGANOX 1135, and/or IRGANOX 5057; each available from BASF SE of Ludwigshafen, Germany), Unitex OB (available from Angene Chemica of Hong Kong), a CHIMASSORB
compound (e.g., CHIMASSORB 81, CHIMASSORB 944 LD, and/or CHIMASSORB 2020 FLD; each available from BASF SE of Ludwigshafen, Germany), a BLS compound (e.g., BLS 99-2, BLS 119, BLS 123, BLS 234, BLS 292, BLS 531, BLS 0113-3, BLS 1130, BLS
1326, BLS 1328, BLS 1710, BLS 2908, BLS 3035, BLS 3039, and/or BLS 5411; each available from Mayzo Inc. of Suwanee, Ga, USA), and/or CYASORB CYNERGY
SOLUTIONS L143-50X Stabilizer (available from Cytec Industries, Inc. of Woodland Park, NJ, USA).
[0087] Nonlimiting examples of light blocking additives (blocks light of a particular wavelength) can include classes of chemical compounds including, but not limited to, inorganic nanoparticles (e.g., metal oxides and metal nanoparticles), organic nanoparticles, organometallic nanoparticles, benzotriazoles (including derivatives thereof).
triazines (including derivatives thereof), triazoles (including derivatives thereof), hindered amine light stabilizers (HALS, including derivatives thereof), benzophenones (including derivatives thereof), silanes having amine functionality (including derivatives thereof), sterically hindered, phenolic antioxidants (including derivatives thereof), silanes having isocyanate functionality (including derivatives thereof), cyanoacrylates, tetraphenylporphyrins, tetramesitylporphyrins, perylenes, oxalanilides, phthalocyanines, chlorophylls (including derivatives thereof), bilirubin (including derivatives thereof), primary antioxidants, pigments dyes (e.g., organometallic dyes), and combinations thereof.
triazines (including derivatives thereof), triazoles (including derivatives thereof), hindered amine light stabilizers (HALS, including derivatives thereof), benzophenones (including derivatives thereof), silanes having amine functionality (including derivatives thereof), sterically hindered, phenolic antioxidants (including derivatives thereof), silanes having isocyanate functionality (including derivatives thereof), cyanoacrylates, tetraphenylporphyrins, tetramesitylporphyrins, perylenes, oxalanilides, phthalocyanines, chlorophylls (including derivatives thereof), bilirubin (including derivatives thereof), primary antioxidants, pigments dyes (e.g., organometallic dyes), and combinations thereof.
[0088] Nonlimiting examples of the dye include bilirubin; chlorophyll a, diethyl ether;
chlorophyll a, methanol; chlorophyll b; deprotonated tetraphenylporphyrin;
hematin;
magnesium octaethylporphyrin; magnesium octaethylporphyrin (MgOEP); magnesium phthalocyanine (MgPc), PrOH; magnesium phthalocyanine (MgPc), pyridine;
magnesium tetramesitylporphyrin (MgTMP); magnesium tetraphenylporphyrin (MgTPP);
octaethylporphyrin; phthalocyanine (Pc); porphin; tetra-t-butylazaporphine;
tetra-t-butylnaphthalocyanine; tetrakis(2.6-dichlorphenyl)porphyrin;
tetrakis(oaminophenyl)porphyrin; tetramesitylporphyrin (TMP);
tetraphenylporphyrin (TPP);
vitamin B12; zinc octaethylporphyrin (ZnOEP); zinc phthalocyanine (ZnPc), pyridine; zinc SUBSTITUTE SHEET (RULE 26) tetramesitylporphyrin (ZnTMP); zinc tetramesitylporphyrin radical cation; zinc tetraphenylporphyrin (ZnTPP); perylene; oxanilide; derivatives thereof; and combinations thereof.
chlorophyll a, methanol; chlorophyll b; deprotonated tetraphenylporphyrin;
hematin;
magnesium octaethylporphyrin; magnesium octaethylporphyrin (MgOEP); magnesium phthalocyanine (MgPc), PrOH; magnesium phthalocyanine (MgPc), pyridine;
magnesium tetramesitylporphyrin (MgTMP); magnesium tetraphenylporphyrin (MgTPP);
octaethylporphyrin; phthalocyanine (Pc); porphin; tetra-t-butylazaporphine;
tetra-t-butylnaphthalocyanine; tetrakis(2.6-dichlorphenyl)porphyrin;
tetrakis(oaminophenyl)porphyrin; tetramesitylporphyrin (TMP);
tetraphenylporphyrin (TPP);
vitamin B12; zinc octaethylporphyrin (ZnOEP); zinc phthalocyanine (ZnPc), pyridine; zinc SUBSTITUTE SHEET (RULE 26) tetramesitylporphyrin (ZnTMP); zinc tetramesitylporphyrin radical cation; zinc tetraphenylporphyrin (ZnTPP); perylene; oxanilide; derivatives thereof; and combinations thereof.
[0089] As nonlimiting examples, the inorganic nanoparticles can include a metal oxide chosen from, but not limited to, cerium oxide (e.g., Ce02), zinc oxide (e.g., Zn0), zirconium dioxide (ZrO2), titanium dioxide (TiO2), stannic oxide/tin oxide (Sn02), antimony pentoxide (Sb205), silicon oxide (SiO2) and the like.
[0090] Non-limiting commercial examples of the dye (e.g., the organometallic dye) include Cu(II) Meso ¨ tetra (4-carboxyphenyl) porphine (e.g., High Performance Optics Dye Generation4D, available from High Performance Optics of Roanoke, Va., or any other suitable High Performance Optics Dye, including Generation 4A, 4B, and/or 4C).
[0091] Nonlimiting examples of the light blocking additive may include TINUVIN
(which includes a red-shifted Tris-Resorcinol-Triazine Chromophore), compounds available from High Performance Optics of Roanoke, Va. (e.g., Generation 4B dye and/or Generation 4D dye), TINUVIN 292, and/or TINUVIN 1130.
(which includes a red-shifted Tris-Resorcinol-Triazine Chromophore), compounds available from High Performance Optics of Roanoke, Va. (e.g., Generation 4B dye and/or Generation 4D dye), TINUVIN 292, and/or TINUVIN 1130.
[0092] The electrochromic gel can be made by combining the electrochromic material and a portion of the polar solvent by mixing under ambient conditions to form an electrochromic material solution, combining the rheology modifying agent and a portion of the polar solvent by mixing, as a nonlimiting example, at a temperature of from 30 C to 120 C to form a rheology modifying agent solution, and combining the electrochromic material solution and the rheology modifying agent solution and allowing the combined solution to cool to ambient conditions to form the electrochromic gel.
[0093] The electrochromic gel can be used to make an electrochromic cell according to this disclosure. The method includes providing a first optical substrate, applying a first conductor over at least a portion of the first optical substrate and optionally over at least a portion of a second optical substrate, applying a second conductor over at least a portion of the first optical substrate such that the second conductor is not in direct contact with the first conductor, applying a coating layer that includes the electrochromic gel described above over at least a portion of the first optical substrate, and optionally over at least a portion of the second optical substrate, and in contact with the first conductor and the second conductor, optionally applying the second optical substrate over the first conductor, the second conductor and electrochromic gel and providing a power source connected to the first conductor and the second conductor.
SUBSTITUTE SHEET (RULE 26)
SUBSTITUTE SHEET (RULE 26)
[0094] When the electrochromic gel is used to coat a first optical substrate, optionally a gel that includes the rheology modifying agent and optionally the electrochromic materials can be applied to the second optical substrate. Optionally, when the electrochromic gel is used to coat a first optical substrate, a surfactant, a solvent, plasma treatments and/or other surface treatments (as a nonlimiting example silanes) can be applied to the second optical substrate to change the surface energy and/or provide better wetting.
[0095] Either of the first conductor and the second conductor can act as a cathode and the other electrode can act as an anode (and can switch when polarity is reversed).
[0096] The first and second optical substrates can be optically clear substrates. When optically clear substrates are used, the first optically clear substrate and the second optically clear substrate independently include glass, flexible polymeric materials and rigid polymeric materials, nonlimiting examples include poly (methyl methaerylate), polycarbonate, polyethylene terephthalate, poly (allyl diglycol carbonate), polyurea, polyurethane, poly-thiourea, and/or poly-thiourethane.
[0097] The first conductor and second conductor can be transparent conductors.
[0098] The first conductor and the second conductor can independently be in the form of a mesh, multiple lines or other patterns as long as the pattern is sufficiently conductive to provide the required electrochromic activity.
[0099] The first conductor and the second conductor can include indium tin oxide, partially octadecyltrichlorsilane covered indium tin oxide, metal mesh (as a nonlimiting example, metalized silver mesh), and conductive nanomaterials including silver nanowires, gold nanovvires, carbon nanotubes, and graphene, fluorine-doped tin oxide, aluminum doped zinc oxide (AZO), and conductive polymers, nonlimiting examples including poly(3,4-ethylenedioxythiophene), the ionomer mixture of poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate, polyacetylene, polyphenylene vinylene; polypyrrole, polythiophene, polyaniline and/or polyphenylene sulfide. Optionally, any transparent conductor can be used, as long as it is sufficiently conductive to provide the required electrochromic activity.
[0100] The electrochromic cell can include, and/or be powered by, an external power source that can provide power of sufficient voltage and current. As a nonlimiting example, a controller can be configured to activate when an electric potential or voltage is required to be applied to the electrodes. As nonlimiting examples, one or more inputs such as optical sensors, temperature sensors, or a switch can be in communication with the controller. The controller can receive input information from the one or more inputs and can be configured to determine whether the power source used to provide an electric potential or voltage to the SUBSTITUTE SHEET (RULE 26) should be provided. As nonlimiting examples, the power source can be a battery, a transformer converting conventional AC or DC current to an acceptable level, a photovoltaic medium, a capacitor, a super capacitor, and combinations thereof. The external power supply can be electrically coupled to the controller and one or more inputs and can be configured to provide electric potential or voltage to the electrodes. More than one supply can be implemented to supply power to the electrochromic cell. The power source, controller, sensors, switches and/or electrodes can be connected by wires or other means known in the art.
[0101] The coating layer that includes the electrochromic gel described herein can be applied using methods known in the art. Nonlimiting examples of methods that can be used to apply the coating layer that includes the electrochromic gel include draw down, screen printing, spin coating, spray application, cut and stick, extrusion, casting, ink jet, gravure, and roll to roll.
[0102] Depending on the composition of the electrochromic gel the coating layer can behave more like a solid or a fluid. The coating layer that includes the electrochromic gel method can have a film thickness of at least 0.1 mil, such as 0.5 mil and lmil and up to 12 mil, such as 10 mil, 8 mil and 5 mil The coating layer can have a thickness of from 0.1 to 12 mil, such as 0.1 to 10 mil. 0.1 to 8 mil, 0.1 to 5 mil, 0.5 to 12 mil, 0.5 to 10 mil, 0.5 to 8 mil, 0.5 to 5 mil, 1 to 12 mil, 1 to 10 mil, 1 to 8 mil. and 1 to 5 mil. The thickness of the coating layer that includes the electrochromic gel can be any thickness or range between any thicknesses recited above.
[0103] The electrochromic cells described herein can include a sealant to seal the perimeter of the cell between the first and second optical substrates. Nonlimiting examples of sealant materials can include those based on epoxy, polyolefin (such as polypropylene, polyethylene, copolymers and mixtures thereof), silicones, polyesters, polyamides and/or polyurethane resins.
[0104] The visible light transmittance through the electrochromic cell in the clear state (no electrochromic color) can be from 50% to 99%, such as from 55 % to 95%, 60% to 90% and 65% to 90%.
[0105] The power supply in the electrochromic cell can be used to apply an electrical potential or voltage between the cathode and anode. The voltage applied to the electrochromic cell; direct current, alternating current or variable voltage;
can be from 0.05 to 50 V, such as 0.1 to 50 V, 0.1 to 40 V, 0.1 to 30 V, 0.5 to 20 V, and 1 to 10 V. The application of an electrical potential or voltage to the electrochromic cell causes an oxidation SUBSTITUTE SHEET (RULE 26) ¨ reduction reaction to take place in the electrochromic gel resulting in the electrochromic cell becoming darker (dark state) and reducing the visible light transmittance through the electrochromic cell.
can be from 0.05 to 50 V, such as 0.1 to 50 V, 0.1 to 40 V, 0.1 to 30 V, 0.5 to 20 V, and 1 to 10 V. The application of an electrical potential or voltage to the electrochromic cell causes an oxidation SUBSTITUTE SHEET (RULE 26) ¨ reduction reaction to take place in the electrochromic gel resulting in the electrochromic cell becoming darker (dark state) and reducing the visible light transmittance through the electrochromic cell.
[0106] The visible light transmittance through the electrochromic cell in the dark state can be from 0.00001 to 50%, such as from 0.0001 to 50%, 0.001 to 50%, 0.1% to 50%, 0.1% to 35%, 0.1% to 25%, 0.1% to10%, 0.5 % to 4%, 1% to 3.5% and 0.1% to 3%, measured according to ASTM E972 at visible spectrum wavelengths between 380 nm and 780 nm.
[0107] The amount of haze in the electrochromic cell in the clear state can be from 0.01%
to 10%, such as from 0.05% to 1 %, 0.5 % to 4%, 1% to 3.5% and 0.1% to 3%, measured using a Hunter UltraScan PRO.
to 10%, such as from 0.05% to 1 %, 0.5 % to 4%, 1% to 3.5% and 0.1% to 3%, measured using a Hunter UltraScan PRO.
[0108] Fig. 1 is a nonlimiting representative plot of transmittance versus time during the operation of electrochromic cells according to this disclosure. In Fig. 1, the cell is initially in its maximum transmittance (as denoted by 650) state and may achieve minimum transmittance (as denoted by 620) on application of a specified voltage. The difference between the maximum and minimum transmittance is the optical contrast (as denoted by 630). As a voltage is applied at A at maximum transmittance state, which can either be direct voltage or pulsed voltage having a specific frequency and amplitude, transmittance of the system decreases. The time to reduce transmittance by 85% of the optical contrast (maximum transmittance 650 minus 85% of optical contrast 630, shown as 610), denoted as point B, indicates the time the system is considered to have reached a fully dark state. Thereafter, the system settles to its minimum transmittance 620. Upon the removal of voltage at point C, which may also include reversal of polarity or decreasing the amplitude of the voltage, the transmittance of the system increases. The time to increase transmittance by 85% of the optical contrast 630 (minimum transmittance 620 plus 85% of optical contrast 630, shown as 640), denoted as point D, indicates the Lime the system is considered to have reached a fully clear state. Thereafter, the system settles to maximum transmittance 650, exhibited by the system during an electrochromic switching cycle.
[0109] When the electrical potential or voltage is applied between the cathode and anode, the electrochromic cell can transition to a fully darkened state, for instance from maximum transmittance to a fully darkened state, in from 0.1 to 30 minutes, such as from 1 to 30 seconds, 5 to 30 seconds, from 10 to 25 seconds, and 15 to 25 seconds. When the electrical potential or voltage is reduced, removed or reversed, the electrochromic cell can transition to a fully clear state, for instance from minimum transmittance to a fully cleared state, in from 0.1 seconds to 60 minutes, such as from 0.1 to 30 minutes, 0.5 to 60 seconds, from 0.1 to 10 SUBSTITUTE SHEET (RULE 26) seconds, and from 0.1 to 1 seconds, measured using a spectrophotometer or a Hunter UltraScan PRO at visible spectrum wavelengths between 380 nm and 780 nm at 25 C. The time to transition from the fully clear state to the fully darkened state at a given voltage can depend on the construction of the electrochromic cell, as nonlimiting examples, the thickness of the coating and the lateral dimensions of the electrochromic cell.
[0110] Constructing an electrochromic cell as described above allows the coating thickness of the coating layer that includes the electrochromic gel to control the gap between the first and second optical substrates.
[0111] When only a first optical substrate is used, interdigitated electrodes can provide a voltage between the electrodes in the open gap and apply the voltage to the electrochromic gel coating layer. A second optical substrate can optionally be used if the electrochromic gel coating layer needs to be protected.
[0112] An advantage of the electrochromic cell as described above is that it eliminates pillowing. Pillowing occurs when the hydrostatic pressure in conventionally constructed electrochromic cells pushes out the center portion of a cell when it is filled/placed in an upright position. Conventionally constructed electrochromic cells are typically filled horizontally or require fixturing to prevent pillowing.
[0113] The electrochromic cells described herein can be used to make or be used as a component in electrochromic devices. As described above, the electrochromic device includes a first optical substrate, a first conductor, a second conductor not in direct contact with the first conductor, a coating layer that includes an electrochromic gel disposed over and in contact with the first conductor and the second conductor, optionally a second optical substrate, and a power source connected to the first conductor and the second conductor. One of the first conductor and the second conductor acts as a cathode and another electrode acts as an anode. Either or both of the first or second optical substrates can be optically clear substrates.
[0114] The electrochromic device can be a component of a viewing device.
Nonlimiting examples of viewing devices according to this disclosure include windows, video display devices, virtual reality devices, smart eyewear, electrochromic eyewear, mirrors, batteries, augmented reality devices, extended reality devices, mixed reality devices, fixed displays, mobile communication devices, privacy screens, cameras, hiding displays, heads of display and automotive side panels.
Nonlimiting examples of viewing devices according to this disclosure include windows, video display devices, virtual reality devices, smart eyewear, electrochromic eyewear, mirrors, batteries, augmented reality devices, extended reality devices, mixed reality devices, fixed displays, mobile communication devices, privacy screens, cameras, hiding displays, heads of display and automotive side panels.
[0115] Fig. 2 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale. Electrochromic device 100 includes first optical substrate 120 SUBSTITUTE SHEET (RULE 26) as described above, first conductor 150 and second conductor 140 as described above, a coating layer 130 that includes an electrochromic gel as described above and second optical substrate 110 as described above. Power source 160 is connected to first conductor 150 and second conductor 140 by wire 190.
[0116] Fig. 3 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale. Electrochromic device 100 includes first optical substrate 120 as described above, first conductor 150 and second conductor 140 as described above, a coating layer 130 that includes an electrochromic gel as described above and second optical substrate 110 as described above. Sealant 170 is disposed at the edges of electrochromic device 100 between first optical substrate 120 and second optical substrate 110. Power source 160 is connected to first conductor 150 and second conductor 140 by wire 190.
[0117] Fig. 4 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale. Electrochromic device 100 includes first optical substrate 120 as described above, first conductor 150 and second conductor 140 as described above, a coating layer 130 that includes an electrochromic gel as described above and second optical substrate 110 as described above. Sealant 170 is disposed at the edges of electrochromic device 100 encompassing all layers from first optical substrate 120 to second optical substrate 110. Power source 160 is connected to first conductor 150 and second conductor 140 by wire 190.
[0118] Fig. 5 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale. Electrochromic device 105 includes first optical substrate 120 as described above, first conductor 150 and second conductor 140 as described above, and a coating layer 130 that includes an electrochromic gel as described above.
Power source 160 is connected to first conductor 150 and second conductor 140 by wire 190.
Power source 160 is connected to first conductor 150 and second conductor 140 by wire 190.
[0119] Fig. 6 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale. Electrochromic device 200 includes first optical substrate 220 as described above, first conductor 270 and second conductor 260 as described above, a coating layer 230 that includes an electrochromic gel as described above and second optical substrate 210 as described above. Power source 285 is connected to first conductor 270 and second conductor 260 by wire 280.
[0120] Fig. 7 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale. Electrochromic device 205 includes first optical substrate 220 as described above, first conductor 270 and second conductor 260 as described above, a SUBSTITUTE SHEET (RULE 26) coating layer 230 that includes an electrochromic gel as described above.
Power source 285 is connected to first conductor 270 and second conductor 260 by wire 280.
Power source 285 is connected to first conductor 270 and second conductor 260 by wire 280.
[0121] Fig. 8 is a nonlimiting example of an electrochromic device according to the disclosure, not drawn to scale. Electrochromic device 300 includes first optical substrate 320 as described above, first conductor 370 and second conductor 360 as described above, a coating layer 330 that includes an electrochromic gel as described above and second optical substrate 310 as described above. Power source 385 is connected to first conductor 370 and second conductor 360 by wire 380.
EXAMPLES
Example 1: Preparation of Eleetroehromic Solutions Comparative Example CE-1. Crosslinkable electrochromic composition.
EXAMPLES
Example 1: Preparation of Eleetroehromic Solutions Comparative Example CE-1. Crosslinkable electrochromic composition.
[0122] According to the quantities in Table 1, the components of Charge 1 were combined and stirred at ambient temperature for 5 minutes, until the solution was homogeneous. The polyester polyols of Charge 2 were added and stirred at ambient temperature for 5 minutes, at which time a hazy green solution was achieved. To this was added Charge 3 with stirring, the solution was capped and stirred overnight at ambient temperature before use. The resulting solution was a liquid and demonstrated Newtonian behavior.
Table 1. Crosslinkable electrochromic composition Component CE-1 (parts by weight) Charge 1 Diheptyl Viologen 2.04 Dimethyl Phenazine 0.81 Propylene Carbonate 61.98 Charge 2 STEPANOL PC-1011-451 5.00 DESMOPHEN 1915U2 5.00 Charge 3 DESMODUR N-3300A3 1.44 1 A polyether polyol available from Stepan Company.
'A polyester polyol available from Covestro.
An aliphatic polyisocyanate available from Covestro.
Examples 2 and 3.
SUBSTITUTE SHEET (RULE 26)
Table 1. Crosslinkable electrochromic composition Component CE-1 (parts by weight) Charge 1 Diheptyl Viologen 2.04 Dimethyl Phenazine 0.81 Propylene Carbonate 61.98 Charge 2 STEPANOL PC-1011-451 5.00 DESMOPHEN 1915U2 5.00 Charge 3 DESMODUR N-3300A3 1.44 1 A polyether polyol available from Stepan Company.
'A polyester polyol available from Covestro.
An aliphatic polyisocyanate available from Covestro.
Examples 2 and 3.
SUBSTITUTE SHEET (RULE 26)
[0123] According to the amounts in Table 2, the ingredients of Charge 1 were combined and stirred for 5 minutes until fully dissolved at ambient conditions. The components of Charge 2 were combined in a separate vessel and heated to 90 C with stirring until the solution was homogeneous.
[0124] The solution of Charge 1 was added to the hot solution of Charge 2 with mixing until a green homogeneous solution was formed. This solution was allowed to cool to ambient conditions to form a thermoreversible electrochromic gel.
Table 2. Thermoreversible electrochromic gel formulations. Values are weights in grams.
Example 2 Exannple 3 Charge 1 Diheptyl Viologen 0.58 0.28 Di-isopropyl Phenazirie 0.23 0.11 Propylene Carbonate 4.22 4.30 Charge 2 PVDF co-HFP4 0.75 1.00 Propylene Carbonate 4.22 4.30 4 Poly(vinylidene fluoride-co-hexafluoropropylene) pellets purchased from Sigma-Aldrich.
Part 2: Characterization of thermoreversible gel of Example 3
Table 2. Thermoreversible electrochromic gel formulations. Values are weights in grams.
Example 2 Exannple 3 Charge 1 Diheptyl Viologen 0.58 0.28 Di-isopropyl Phenazirie 0.23 0.11 Propylene Carbonate 4.22 4.30 Charge 2 PVDF co-HFP4 0.75 1.00 Propylene Carbonate 4.22 4.30 4 Poly(vinylidene fluoride-co-hexafluoropropylene) pellets purchased from Sigma-Aldrich.
Part 2: Characterization of thermoreversible gel of Example 3
[0125] The gel of Example 3, starting at ambient conditions, was characterized using an Anton Paar MCR 302 rheometer with a cone and plate configuration having a 25 mm diameter and 1 degree cone angle equipped with RhcoCompass software.
[0126] Fig. 9 is a graph of viscosity (mPa*s) vs. shear rate (s-1) demonstrating the shear thinning behavior of the electrochromic gel at 25 C (shown as 430) and 90 C
(shown as 410 and 420). At 25 C, the electrochromic gel exhibits a yield point of about 5 x i07 mPa*s at about 0.002 s-1. The viscosity decreases to a viscosity of about 100 mPa*s at about 8 s-1. From about 0.01 s-1 to about 1 s-1, the slope of the curve is about 3 mPa* s2. At 90 C, the electrochromic gel demonstrates different behavior. At 90 C, the ln viscosity (mPa*s) vs.
shear rate (s-1) curve is relatively flat ranging from about 0.2 to 0.4 mPes, ranging from about -0.5 to 0.5 mPa-s2 at 90 C at about 0.1 s-1 to about 1,000 s-1.
(shown as 410 and 420). At 25 C, the electrochromic gel exhibits a yield point of about 5 x i07 mPa*s at about 0.002 s-1. The viscosity decreases to a viscosity of about 100 mPa*s at about 8 s-1. From about 0.01 s-1 to about 1 s-1, the slope of the curve is about 3 mPa* s2. At 90 C, the electrochromic gel demonstrates different behavior. At 90 C, the ln viscosity (mPa*s) vs.
shear rate (s-1) curve is relatively flat ranging from about 0.2 to 0.4 mPes, ranging from about -0.5 to 0.5 mPa-s2 at 90 C at about 0.1 s-1 to about 1,000 s-1.
[0127] Fig. 10 is a graph, ln complex viscosity (mPa*s) (measured at 1% shear strain and radis frequency) on one y axis and temperature ( C) on the other y axis vs.
time (minutes) SUBSTITUTE SHEET (RULE 26) demonstrating the temperature dependent complex viscosity behavior of the electrochromic gel at from 25 C to 90 C. When the ambient electrochromic gel is initially evaluated it exhibits a viscosity of about 2x106 mPa*s at 25 C, which decreases to about 1700 mPes at 90 C over about 6 minutes (shown as 510 for complex viscosity and 500 for time). The slope of the decrease is about -115,000 niPa*s/"C from about 60 to about 75 C. The electrochromic gel recovers viscosity (shown as 530) as the temperature is decreased beginning at about 1000 mPa*s at 90 C (after sitting under those conditions for about 2 minutes, 520) and increases to about 7,000 mPa*s at 25 C (shown as 550) over about 6 minutes (shown as 540).
The slope of the recovery is about 1,000 mPa*s/ C from about 80 to about 35 C.
The viscosity continues to recover over time to about 100,000 mPa*s (shown as 570) after about 35 minutes (shown as 560) at 25 C. The slope of the recovery at 25 C is about 2,500 mPa*s/minute from about 15 minutes after reaching 25 C to about 35 minutes after reaching 25 C.
Part 3: Assembly of Electrochromic Cells Comparative Example CE-1A.
time (minutes) SUBSTITUTE SHEET (RULE 26) demonstrating the temperature dependent complex viscosity behavior of the electrochromic gel at from 25 C to 90 C. When the ambient electrochromic gel is initially evaluated it exhibits a viscosity of about 2x106 mPa*s at 25 C, which decreases to about 1700 mPes at 90 C over about 6 minutes (shown as 510 for complex viscosity and 500 for time). The slope of the decrease is about -115,000 niPa*s/"C from about 60 to about 75 C. The electrochromic gel recovers viscosity (shown as 530) as the temperature is decreased beginning at about 1000 mPa*s at 90 C (after sitting under those conditions for about 2 minutes, 520) and increases to about 7,000 mPa*s at 25 C (shown as 550) over about 6 minutes (shown as 540).
The slope of the recovery is about 1,000 mPa*s/ C from about 80 to about 35 C.
The viscosity continues to recover over time to about 100,000 mPa*s (shown as 570) after about 35 minutes (shown as 560) at 25 C. The slope of the recovery at 25 C is about 2,500 mPa*s/minute from about 15 minutes after reaching 25 C to about 35 minutes after reaching 25 C.
Part 3: Assembly of Electrochromic Cells Comparative Example CE-1A.
[0128] Two Indium Tin Oxide (ITO) coated glass substrates having dimensions of 50 x 70 x 1.1 mm, and a surface resistivity of about 3 S2/sq (obtained from Delta Technologies Limited) were assembled with the coated sides facing one another, and a PTFE, spacer sandwiched between the glass substrates to set the thickness at 400 p.m. A two-part epoxy sealant was applied and cured at 120 'V for 1 hour one edge at a time. Before sealing the final edge, the PTFE spacer was removed from between the glass. When sealing the final edge, a fill port was left that is about 0.5 inches long.
[0129] After fully curing all epoxy layers, the curable electrochromic solution of Example CE-1 was added to the cell through the fill port via a plastic pipette. Air bubbles were removed by applying vacuum. The filled cell assembly was heated at 85 C for 2 hours to form a crosslinked electrochromic gel. The cell was then degassed 5 times under vacuum no lower than 67.7 kPa, then kept at 16.9 kPa overnight. The next day, the fill port was sealed with urethane adhesive (LORD 7150A/B), which was cured at ambient conditions for 1 hour. Lead wires from the power supply were attached to the ITO coated sides of the glass substrates to create an electrochemical cell.
Examples 2A and 3A.
SUBSTITUTE SHEET (RULE 26)
Examples 2A and 3A.
SUBSTITUTE SHEET (RULE 26)
[0130] For each of Examples 2A and 3A, a first ITO glass substrate as described in CE-1 was placed on an AFA-II automated draw down table from Henan Chuanghe Laboratory Equipment Co. Ltd., with the coated side up. For each cell assembly, the formulation of Example 2 or 3, respectively, was heated at 50 C under ¨100 rpm agitation for 10 minutes, then slot-die coated onto the ITO side of the first glass substrate to achieve the indicated thickness. The coated substrate remained at ambient temperature for one hour, at which time the thermoreversible gel had resolidified. The second glass substrate was placed over the thermoreversible gel coating with the ITO coated side toward the coating. Lead wires from the power supply were attached to the ITO coated sides of the glass substrates to create an electrochemical cell similar to what is depicted in Fig. 2.
Part 3: Performance Evaluation of Electrochromic Cells
Part 3: Performance Evaluation of Electrochromic Cells
[0131] After assembly, each electrochromic cell was evaluated for maximum transmittance range, transition time from fully dark (voltage applied) to fully clear (voltage removed), and haziness. The results are shown in Table 3. In these results, transmittance refers to the percentage of visible light at 555 nm frequency that passed through the sample. The measurements for CE-1A were made at 25 C using a Color i7 spectrophotometer, manufactured by X-Rite. The measurements for Examples 2A and 3A were made at using an UltraScan PRO spectrophotometer, manufactured by HunterLab.
SUBSTITUTE SHEET (RULE 26) Table 3. Optical and Switching Characteristics Comparison for Electrochromic cells Example 2A Example 3A
Activation Voltage (V) 1.2 1.2 1.2 AC/DC DC DC
DC
Sample Thickness (mil) 16 1 4 Clear-State Transmittance (%T) @555tun 55 76 Dark-State Transmittance (%T) @555nm 0 2 5 Optical Contrast (A%T) @555nm 55 74 Clear-to-Dark Switching Speed (s) Not measured Not measured 8 Dark-to-Clear Switching Speed (s) 21 15 %Haze 0 2.5 0.3
SUBSTITUTE SHEET (RULE 26) Table 3. Optical and Switching Characteristics Comparison for Electrochromic cells Example 2A Example 3A
Activation Voltage (V) 1.2 1.2 1.2 AC/DC DC DC
DC
Sample Thickness (mil) 16 1 4 Clear-State Transmittance (%T) @555tun 55 76 Dark-State Transmittance (%T) @555nm 0 2 5 Optical Contrast (A%T) @555nm 55 74 Clear-to-Dark Switching Speed (s) Not measured Not measured 8 Dark-to-Clear Switching Speed (s) 21 15 %Haze 0 2.5 0.3
[0132] As shown in Table 3, the coated cells demonstrated fast switching speeds over a larger optical contrast than the corresponding crosslinked electrochromic system of CE-1A.
In addition, the coatings of Examples 2 and 3 demonstrate higher contrast and higher transmittance at significantly lower thicknesses.
In addition, the coatings of Examples 2 and 3 demonstrate higher contrast and higher transmittance at significantly lower thicknesses.
[0133] Whereas particular embodiments of this disclosure have been described above for purposes of illustration, it will be evident to those skilled in the art that numerous variations of the details of the present disclosure may be made without departing from the disclosure as defined in the appended claims.
SUBSTITUTE SHEET (RULE 26)
SUBSTITUTE SHEET (RULE 26)
Claims (31)
1. An electrochromic gel comprising:
20 to 99 wt.% of a polar solvent, 0.5 to 25 wt.% of a rheology modifying agent, and 0.5 to 20 wt.% of an electrochromic material;
wherein the rheology modifying agent dissolved in the polar solvent forms a thermoreversible gel; and wherein the thermoreversible gel is a gel at 25 C and is a fluid at 120 C.
20 to 99 wt.% of a polar solvent, 0.5 to 25 wt.% of a rheology modifying agent, and 0.5 to 20 wt.% of an electrochromic material;
wherein the rheology modifying agent dissolved in the polar solvent forms a thermoreversible gel; and wherein the thermoreversible gel is a gel at 25 C and is a fluid at 120 C.
2. The electrochromic gel according to claim 1, wherein the polar solvent comprises Ci to C6 alkyl carbonates, Ci to C6 alkyl phosphates, acetone, methyl isobutyl ketone, methyl ethyl ketone, dimethyl formamide, and/or dimethyl sulfoxide.
3. The electrochromic gel according to either of claims 1 or 2, wherein the polar solvent comprises Ci to C6 alcohols, water, and/or formamide.
4. The electrochromic gel according to any of claims 1 through 3, wherein the rheology modifying agent comprises poly(vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), poly(vinyl chloride), poly(vinyl alcohol), poly(methyl (meth)acrylate), poly(ethylene oxide), poly(vinyl pyrrolidone) and/or poly(propylene carbonate).
5. The electrochromic gel according to any of claims 1 through 4, wherein the electrochrornic material comprises a cathodic electrochromic agent and an anodic electrochromic agent.
6. The electrochromic gel according to any of claims 1 through 5, wherein the cathodic electrochrornic agent comprises viologen and its derivatives, and the anodic electrochromic agent comprises phenazine, phenazine derivatives, and/or N,N,N' ,N' -tetramethyl-p-phenylenediamine.
7. A method of making the electrochromic gel according to any of claims 1 through 6 comprising SUBSTITUTE SHEET (RULE 26) combining the electrochromic material and a portion of the polar solvent by mixing under ambient conditions to form an electrochromic material solution, combining the rheology modifying agent and a portion of the polar solvent by mixing at a temperature of from 30 C to 120 C to form a rheology modifying agent solution, combining the electrochromic material solution and the rheology modifying agent solution and allowing the combined solution to cool to ambient conditions to form the electrochromic gel.
8. A method of making an electrochromic cell comprising applying a first conductor over at least a portion of a first optical substrate, applying a second conductor over at least a portion of the first optical substrate such that the second conductor is not in direct contact with the first conductor, and applying a coating layer comprising an electrochromic gel according to any of claims 1 through 7 over at least a portion of the first optical substrate and optionally over at least a portion of a second optical substrate, wherein the coating layer is in contact with the first conductor and the second conductor.
9. The method of making an electrochromic cell according to claim 8 comprising applying a second optical substrate over the first conductor, the second conductor and electrochromic gel.
10. A method of making an electrochromic cell comprising applying a first conductor over at least a portion of a first optical substrate, applying a coating layer comprising an electrochromic gel according to any of claims 1 through 7 over at least a portion of the first optical substrate and in contact with the first conductor, SUBSTITUTE SHEET (RULE 26) optionally applying a coating layer comprising an electrochromic gel according to any of claims 1 through 7 over at least a portion of a second optical substrate, applying a second conductor over at least a portion of the second optical substrate, and applying the second optical substrate over the first optical substrate, first conductor, and electrochromic gel, such that the second conductor is not in direct contact with the first conductor.
11. The method according to any of claims 7 through 10, wherein the first and second optical substrates are optically clear substrates and the first optically clear substrate and the second optically clear substrate each independently comprise glass, flexible polymeric materials and rigid polymeric materials selected from poly (methyl methacrylate.), polycarbonate, polyethylene terephthalate, poly (allyl diglycol carbonate), polyurea, polyurethane, polythiourea, and/or polythiourethane.
12. The method according to any of claims 7 through 11, wherein one or both of the first conductor and second conductor are independently transparent conductors.
13. The method according to any of claims 7 through 12, wherein the first conductor and second conductor independently comprise indium tin oxide, fluorine-doped tin oxide, partially octadecyltrichlorsilane covered indium tin oxide, metal mesh, silver nanowires, aluminium doped zinc oxide (AZO), carbon nanotubes, graphene and/or conductive polymers.
14. The method according to any of claims 7 through 13, wherein the coating layer comprising an electrochromic gel is applied using a method comprising draw down, screen printing, spin coating, spray application, cut and stick, extrusion, casting, ink jet, gravure, and/or roll to roll.
15. The method according to any of claims 7 through 14, wherein the coating layer has a thickness of from 0.1 to 12 mil, such as 0.1 to 10 mil, 0.1 to 8 mil, 0.1 to 5 mil, 0.5 to 12 mil, 0.5 to 10 mil, 0.5 to 8 mil, 0.5 to 5 mil, 1 to 12 mil, 1 to 10 mil, 1 to 8 mil, and 1 to 5 mil.
SUBSTITUTE SHEET (RULE 26)
SUBSTITUTE SHEET (RULE 26)
16. The method according to any of claims 7 through 15, wherein the thickness of the coating layer that includes the electrochromic gel controls the space between the first substrate and second substrates.
17. The method according to any of claims 7 through 16, wherein the visible light transmittance through the electrochromic cell in the clear state is from 50%
to 99%
measured using a Hunter UltraScan PRO at visible spectrum wavelengths between 380 nm and 780 nm.
to 99%
measured using a Hunter UltraScan PRO at visible spectrum wavelengths between 380 nm and 780 nm.
18. The method according to any of claims 7 through 17, wherein the visible light transmittance through the electrochromic cell in the dark state is from 0.00001 to 50%, such as from 0.0001 to 50%, 0.001 to 50%, 0.1% to 50%, 0.1% to 35%, 0.1%
to 25%, 0.1% to10%, 0.5 % to 4%, 1% to 3.5% and 0.1% to 3%, measured according to ASTM E972 at visible spectrum wavelengths between 380 nm and 780 nm.
to 25%, 0.1% to10%, 0.5 % to 4%, 1% to 3.5% and 0.1% to 3%, measured according to ASTM E972 at visible spectrum wavelengths between 380 nm and 780 nm.
19. The method according to any of claims 7 through 18, wherein the haze in the electrochromic cell in the clear state is from 0.05% to 10%, such as from 0.05% to 1 %, 0.5 % to 4%, 1% to 3.5% and 0.1% to 3% measured using a spectrophotometer or Hunter UltraScan PRO at visible spectrum wavelengths between 380 nm and 780 nm at 25 C.
20. The method according to any of claims 7 through 19, wherein the electrochromic cell transitions to a fully darkened state, upon application of a voltage, in from 0.1 to 30 seconds, such as from 1 to 30 seconds, 5 to 30 seconds, from 10 to 25 seconds, 15 to 25 seconds, 1 second to 1 minute, 1 second to 5 minutes, 1 second to 10 minutes, 1 second to 15 minutes and 1 second to 30 minutes measured using a spectrophotometer or Hunter UltraScan PRO at visible spectrum wavelengths between 380 nm and 780 nm at 25 C.
21. An electrochromic device comprising the cell made according to a method according to any of claims 7 through 20, wherein the electrochromic cell transitions to a fully clear state, upon reduction and/or removal and/or reversal of a voltage, in from 0.1 seconds to 60 minutes, such as from 0.1 to 30 minutes, 0.5 to 60 seconds, from 0.1 to seconds, and 0.1 to 1 seconds, measured using a spectrophotometer or a Hunter UltraScan PRO at visible spectrum wavelengths between 380 nm and 780 nm at 25 C.
SUBSTITUTE SHEET (RULE 26)
SUBSTITUTE SHEET (RULE 26)
22. An electrochromic device made according to a method according to any of claims 11 through 24.
23. An electrochromic device comprising a first optical substrate comprising, a first conductor, a second conductor not in direct contact with the first conductor, and a coating layer comprising an electrochromic gel according to any of claims 1 through 7 disposed over and in contact with the first conductor and the second conductor; and a power source.
24. The electrochromic device according to claim 23 comprising a second optical substrate.
25. The electrochromic device according to either of claims 23 or 24, wherein the first and/or second optical substrates are optically clear substrates.
26. The electrochromic device according to any of claims 23 through 25, wherein the first optical substrate and the second optical substrate comprise glass, flexible polymeric materials and rigid polymeric rnaterials, poly (methyl Inethacrylate), polycarbonate, polyethylene terephthalate, poly (allyl diglycol carbonate), polyurea, polyurethane, poly-thiourea, and/or poly-thiouethane.
27. The electrochromic device according to claims 23 through 26, wherein one or both of the first conductor and second conductor are transparent conductors.
28. The electrochromic device according to any of claims 23 through 27, wherein the first conductor and second conductor comprise indium tin oxide, partially octadecyltrichlorsilane covered indium tin oxide, metal mesh, silver nanowires, gold nanowires, and/or conductive polymers.
29. The electrochromic device according to any of claims 23 through 28, wherein the coating layer comprising an electrochromic gel is applied using a method comprising SUBSTITUTE SHEET (RULE 26) draw down, slot-die, screen printing, spin coating, spray application, cut and stick, extrusion, casting, ink jet, gravure, and/or roll to roll.
30. A viewing device comprising the electrochromic device according to any of claims 23 through 29.
31. A viewing device according to claim 30 comprising windows, video display devices, virtual reality devices, smart eyewear, electrochromic eyewear, mirrors, batteries, augmented reality devices, extended reality devices, mixed reality devices, fixed displays, mobile communication devices, privacy screens, cameras, hiding displays, heads of display and/or automotive side panels.
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CN (1) | CN118265762A (en) |
CA (1) | CA3235101A1 (en) |
IL (1) | IL312260A (en) |
WO (1) | WO2023081667A1 (en) |
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WO2018017875A1 (en) * | 2016-07-20 | 2018-01-25 | University Of Utah Research Foundation | Active electrochromic films |
CN112666771A (en) * | 2020-12-25 | 2021-04-16 | 广州熵能创新材料股份有限公司 | Electrochromic assembly and electrochromic device prepared by same |
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2022
- 2022-11-02 WO PCT/US2022/079098 patent/WO2023081667A1/en active Application Filing
- 2022-11-02 IL IL312260A patent/IL312260A/en unknown
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- 2022-11-02 CN CN202280073535.4A patent/CN118265762A/en active Pending
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KR20240090284A (en) | 2024-06-21 |
CN118265762A (en) | 2024-06-28 |
IL312260A (en) | 2024-06-01 |
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